Plot overlays on images

[Peter von Niederhaeusern]

Hi all

As I've already found out (see the thread "Quiver on an image (SIVP
toolbox)") it is not
possible to use the plotting functionality of Scilab with the SIVP
'imshow' function.

The IDP toolbox, however, has a function ('ShowImage') that uses the
Scilab plotting context.
So mixing plots from functions and images is possible. Unfortunately,
there is one problem:
the alignment (orientation) of the plots and the images. As soon as
the figure is created, it
is no longer possible to adjust the plots/images independently (say,
to rotate the plot to match
a predefined orientation given by the image).

Is there a Scilab function to
a) rotate an image
b) rotate a child of a compound (for plotting)

See the attached screenshot (example.jpg), where the quiver (black
vector field) should be rotated by 90°.

Thank you very much for a hint
Peter
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